Waterproof board and process of making same



L. KI'RSCHBHAUN.

WATERPROOF BOARD AND PROCESS 0F MAKING SAME.

APPLICATION FILED IIIAY 28, 1920.

Patented May 30, 1922.

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LESTER KIRSCHBRAUN,

0F CHICAGO, l ILLINOIS.

WATERPRQOE BOARD AND PROCESS or MAKING SAME Application led May 28, 1920. Serial No.

To all wlw'm t may conce/m:

Be it known that I, LESTER KIRSCHBRAUN, v a citizen of the United States, residing in the city of Chicago, county -of Cook, and State of Illinois, have invented certain new and useful Improvements in Waterproof Boards and rocesses of Making Same, of which the following is a Specification.

Among the salient objects of this invention are to produce a product having an inherent structuralI stiffness4 and which consists essentially of a rigid cement liller imbedded between two or more plies of grit surfaced Fig. l is an edge view of the two plies in position to tbe united.

F ig.y 2 is an edge view of the combined plies with a granular surface imposed thereon, and i Fig. 3 is an edge view of a single ply having the reinforcement applied to its surface and a vari-colored grit surfacing imposed on the reinforcement.

The roofing plies l may be made in the usual manner and the grit surfacing on the roofing sheet or waterproofing element may be relatively cheap. For example, gravel, limestone, quartz, .brick or any'stif comminuted particles 2 may be used for the facing. These particles are, of course, par'- ti'ally imbedded in the coating 3 of the waterproofing sheet in the usual manner.

Over the comminuted surfaceof one-of these lplies is spread a plastic mortar 4f composed of a rigid cementitious material, as for iexample, Portland cement or magnesite cement, the latter being preferablefor the rea son,that it has a littlel flexibility. The two lies are then Epressed together as shown in ig. 2 so that the mortar Hows into the interstices of the comminuted particles,.so as to firmly engage and cement the plies as the mortar sets. lThe inherent strength and stiffness of this mortar filler ermits of the use of relatively thin fabric p ies.

One of the exposed outer surfaces of this sheet can have applied to it a granular facing 5 of an attractive color such as red or which facing canbe applied either before or after the plies are reunited together. f

If it is desired to make a single. ply wall Speciication'of Letters Patent.

vmanner heretofore ferent arts where a rigid bedded between said board, the mortar 4 is applied to the grit covered surface of coated fabric sheet as shown in Fig. 3 in the described. and then before the mortar sets, there is projected into y v designs such for eX- ample as 1n dashes and stuccos.

lVherethe rigid mortar forms the exposed surface 1t 1s preferable to have a magnesium oxychloride cement mortar as this can be colored. In this manner may be made a preformed wall board which may be from The lproduct lends itself particularly to the production of a roofing element of a tilelike character which may 4be laid to closely resemble a tiled surface and besides having to aconsiderable degree the weathering and wearing qualities of tile, it may a'lso be formed in the attractive and ornamental designs of the tile covering. In addition this product vmay ybe utilized in a variety of difv non-conducting substance is adaptablel 4 v I claim'as my invention: v

l. A wall board composition consisting of a plurality of relatively thin saturated felted. fibrous plies, the opposed surfaces thereof being adhesively united with a rigid cementitious substanceiand comminuted reinforcing-particles coating said plies, a coating and granular facing on an exposedsurface of said composition.

2. A waterproof composition consisting of aplurality of saturated felted fibrous plies,

OFFICE. y

Patented May 3o, 192:2.l

a single saturated and the opposed surfaces thereof being adhesively united by a rigid cementitious substance, and comminuted reinforcing particles implies. f 3. A process of making wall board composition having rigid structuralstiifness consisting in adhesively uniting by means of a rigid cementitious substance two relatively thin bitumen saturated felted fibrous sheets containing imbedded comminuted reinforcing particles between the opposed faces of said plies.

4. processof making a waterproof composition consisting in forming a'v plurality vof bituminous saturated felted fibrous plies adhesively applying comminuted reinforcing Aparticles to one face of each ply, uniting the of the other ply, thus producing a product face of the plies to which said comminuted having inherent structural stiiness. 1n particles are imbedded by means of a bitumi- 1 5. A Waterproof boalrd composition formed nous binder and forcing the plies together of fibrous sheets, a rigid cementitious subby means of rigid cementitious substance so stance and cornmnuted particles so disposed that the angular projections of the commito each other to reinforce the composition, nuted particles .of one ply Will enter the into periit 1t retaininga molded form.

terstices between the lcomminuted particles l LESTER KIRSCHBRAUN. 

